Development Resources/How to Use Eclipse Copyright Tool

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Install the org.eclipse.releng.tools plugin to Eclipse

You can use the standard software installer ("Help > Install New Software...") to add the Eclipse Project's Releng Tools to your Eclipse configuration.
Usually the depicted updatesite is part of the default ones, but you also may copy this http://download.eclipse.org/eclipse/updates/4.12-I-builds/ one here.
Adjust the number "4.12" to the number matching your eclipse version.